/* roulang page: index */
:root {
            --primary: #1A56DB;
            --primary-light: #EFF6FF;
            --accent: #0D9488;
            --danger: #E02424;
            --bg: #FFFFFF;
            --bg-alt: #F8FAFC;
            --text-main: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border: #E2E8F0;
            --radius: 12px;
            --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.05), 0 1px 2px -1px rgba(0, 0, 0, 0.05);
            --shadow-hover: 0 10px 25px -5px rgba(26, 86, 219, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
            --container-width: 1200px;
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; color: var(--text-body); line-height: 1.7; background-color: var(--bg); }
        a { text-decoration: none; color: inherit; transition: all 0.2s; }
        h1, h2, h3 { color: var(--text-main); line-height: 1.3; }
        
        .container { max-width: var(--container-width); margin: 0 auto; padding: 0 20px; }
        
        /* Header */
        header { background: #fff; border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; }
        .top-bar { font-size: 12px; background: var(--bg-alt); padding: 8px 20px; display: flex; justify-content: space-between; border-bottom: 1px solid var(--border); }
        .nav-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
        .logo { font-size: 20px; font-weight: 700; color: var(--primary); }
        .nav-links a { margin-left: 24px; font-weight: 500; color: var(--text-main); }
        .nav-links a:hover { color: var(--primary); }
        .btn-cta { background: var(--primary); color: #fff; padding: 10px 20px; border-radius: var(--radius); font-weight: 600; display: inline-flex; align-items: center; }
        .btn-cta:hover { background: #1e40af; transform: translateY(-1px); }

        /* Hero */
        .hero { padding: 80px 0; background: linear-gradient(135deg, #f8fafc 0%, #ffffff 100%); display: flex; align-items: center; min-height: 500px; }
        .hero-content { flex: 1; }
        .hero h1 { font-size: 48px; margin-bottom: 20px; color: var(--text-main); }
        .hero p { font-size: 18px; color: var(--text-muted); margin-bottom: 32px; max-width: 600px; }
        .hero-img { flex: 1; text-align: right; }
        .hero-img img { max-width: 100%; border-radius: var(--radius); box-shadow: var(--shadow-hover); }

        /* Sections */
        section { padding: 80px 0; }
        .section-header { text-align: center; margin-bottom: 50px; }
        .section-header h2 { font-size: 36px; margin-bottom: 16px; }
        
        /* Grid System */
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
        .card { background: #fff; padding: 30px; border: 1px solid var(--border); border-radius: var(--radius); transition: all 0.3s; }
        .card:hover { border-color: var(--primary); box-shadow: var(--shadow-hover); transform: translateY(-4px); }
        
        /* Stats */
        .stats-bar { display: flex; justify-content: space-between; background: var(--text-main); color: #fff; padding: 40px; border-radius: var(--radius); margin: 40px 0; }
        .stat-item { text-align: center; }
        .stat-val { font-size: 32px; font-weight: 700; display: block; }
        
        /* Footer */
        footer { background: var(--text-main); color: #94a3b8; padding: 60px 0 20px; }
        .footer-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 40px; }
        .footer-logo { color: #fff; font-size: 18px; font-weight: 700; margin-bottom: 16px; display: block; }
        
        /* Responsive */
        @media (max-width: 768px) {
            .hero { flex-direction: column; text-align: center; }
            .grid-3 { grid-template-columns: 1fr; }
            .hero-img { margin-top: 40px; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }